Pain in the right lower part of the heart may be intercostal neuralgia, stomach pain, gastroesophageal reflux, angina pectoris, myocardial infarction, arterial entrapment and other conditions. 1. Intercostal neuralgia: intercostal neuralgia is mostly skin pain, the pain site is mostly strip distribution, the pain along the nerve distribution site is obvious, with the prolongation of time can appear red rash. 2. Chronic gastritis, gastric ulcer, etc.: Chronic gastritis and gastric ulcer can also cause subcostal pain, and there is a history of gastric disease. 3. Gastroesophageal reflux: Gastroesophageal reflux can also cause subxiphoid pain, which should be differentiated according to past medical history and the presence of acid reflux. 4. Angina pectoris: angina pectoris is often triggered by physical activity or emotional excitement and lasts for 3-5 minutes. 5. Myocardial infarction: the pain of myocardial infarction is severe, and the pain can be accompanied by shoulder and back pain when sweating profusely. 6. Thoracoabdominal aortic coarctation: arterial coarctation is characterized by sudden tearing pain in the precordial region, accompanied by palpitations (rapid heartbeat, often accompanied by panic), chest tightness, shortness of breath, and other conditions. There are many causes of precordial pain, precordial pain is mostly an emergency, if such a situation is recommended to immediately go to the hospital for further clarification of the cause of pain.